1. Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
2. Social and Economic Sciences Research Center, Washington State University, Pullman, WA 99164, USA
3. College of Veterinary Medicine, Washington State University, Pullman, WA 99164, USA
4. Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, WA 99164, USA